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Deferred Income and Revenue Participation Rights - Participating Revenue Rights (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Deferred Revenue Arrangement [Line Items] |  |
Revenue participation rights | $ 4,643,750 | $ 4,643,750
"Cambridge" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation rights | 825,000 | 825,000
"Seattle" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation rights | 62,500 | 62,500
Galt Resources, LLC (HMS Victory project) [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation rights | $ 3,756,250 | $ 3,756,250

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